On the EV drives they say (3050 rpm at 72V Unloaded) but on the data sheet to download it says max rpm 5000 so i cant really trust it.
Thunderstruck says 3700 rpm unloaded and 2800rpm loaded
confusing and I cant trust it for my calculations...

I guess 3050rpm is max continuous and 5000 is max peak for one minute @ 400Amps??

Has anybody with this motor an idea of actual max loaded rpm and at what voltage??

Unloaded is one thing, but it's not at all indicative - what you're more likely to find out looking for max speed unloaded, is what speed the whole thing turns into a grenade at - which is of course, nothing to do with the speed it will do when it's loaded.

You're right in that the voltage you apply dictates your maximum RPM, but you have to be able to apply that voltage.
Any load will lead to increased current consumption and then sooner or later you reach your limit based on either approaching the thermal limits of the motor, or voltage sag in the battery pack.

So - long story short, without a fully quantified apparatus, it's an entirely subjective number.

Best guess you'll be able to make for the sake of your calculations is to quantify the load, then look at the max current your pack can deliver and the voltage it can deliver it at; the voltage will tell you the rpm you can run, and the current will tell you the max load you can run at that rpm.

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Yeah saw that, might be interesting as it gives you a chance to upgrade to higher voltage, I can only do 72v with leadacid due to space.

Has anybody an idea or even a graph showing the torque and amp when under full acceleration?
I am trying to calculate the acceleration that i will be getting from my "imaginary"bike.

Specs I have in my calculator (Lennon Rodgers calculator heavily modified)...
72V/80Ah Leadacid
Total mass 390kg (including rider)
time to 80kmh = 9.5s (to achive that I need 82Nm from the go off the line up to 93Nm at finish off acceleration at 80kmh)
gear ratio 3.5
Wheelradius 0.32m
frontal area 0.7m2 and air drag coeff of 0.6

With this setup i could theoretically do 97kmh at 2800rpm

Would be nice to know if someone could confirm that the acceleration is realistic?
Unfortunate that most people I found on youtube dont put their acceleration data in their specs. Any data is very welcome :-)

Based on the numbers you've provided, and assuming an armature diameter of 6" (housing is 8" so that seems logical enough), then the force required at the edge of the rotor, in order to produce the 93Nm you've calculated a being required, is 1240N. (Nm/rotor radius[0.075m]).

You require this force at your terminal velocity of 80km/h (23m/s) which happens at a wheel rpm of 670 [edited from 2400 in response to correction pointed out in post #10 below].

With your gearing and combined wheel-tyre radius, that requires a rotor angular velocity of 252.8rad/s.

Given a rotor radius of 0.075m as per the assumption above, that translates to a linear velocity of 19m/s at the rotor edge.

Your power requirement at the rotor edge then is N.V -> 1240*19=23560W

The V/RPM constant for the ME1003, according to the datasheet, is 0.02; this means that 2400rpm happens at 48V.
Your current requirement for this performance is subsequently in the region of 490A.

According to the datasheet, peak stall current for the motor is 500A, and it can take that current for 10 seconds.

So - to answer your question - that acceleration is achievable, but you're pushing the ragged edge of what the motor can do.

On the other hand however, a 72V pack can get you 3600rpm, so if you could up your gear to from 3.5 to 5, you could get the same performance from about 230A.

Podolofsky, feel free to take a look through those numbers just in case I've made any errors in there, but I'm reasonably sure it's all correct.